36 BULLETIN 1387, U. S. DEPARTMENT OF AGRICULTURE 
BULK ROWS 
Table 19 shows the annual and average yields in pounds per rod 
row for 115 varieties and selections grown in bulk rows in the nurs- 
ery. These varieties, except new importations, are pure-line varie- 
ties or selections. The rows were seeded at approximately the same 
rate as that used on commercial fields. The yields of the check rows 
are for the Wataribune variety in 1918, 1919, and 1920, and for the 
Caloro variety in 1921, 1922, and 1923. As a rule the bulk rows have 
yielded better than the head rows, partly because of heavier seeding 
and better stands. 
All the varieties and selections grown during the entire six-year 
period from 1918 to 1923, inclusive, were short-grain rices, except 
Selection No. 113, a mid-season long-grain rice; Edith, a late-maturing- 
long-grain variety; and Selection No. 133, a mid-season medium- 
grain variety. Only two early short-grain varieties, C. I. No. 1992 
and C. I. No. 2008, were grown during the entire six-year period, 
and both are comparatively low in rank. 
During the six-year period from 1918 to 1923, inclusive, many of 
the mid-season short-grain selections gave higher average yields than 
the nearest checks. The seven highest yielding mid-season short- 
grain selections were Nos. 219, 212, 233, 221, 222, 131, and 147, these 
varieties outyielding the nearest check by 0.48, 0.44, 0.43, 0.39, 0.29, 
0.19, and 0.19 pounds per row, respectively. Ten mid-season short- 
grain selections gave average yields equal or superior to the average 
yield of the highest yielding check included within this group. 
Of the late short-grain varieties and selections grown during the 
six-year period six varieties produced higher average yields than 
the nearest check. The highest yielding varieties were Wataribune 
(C. I. No. 1561), C. V I. No. 2030, and Selection No. 206, exceeding 
the average yield of the nearest check by 0.21, 0.14, and 0.08 pounds 
per row, respectively. 
The mid-season long-grain Selection No. 113 was slightly superior 
to the check in yield; the medium-grain Selection No. 133 and the 
late long-grain variety Edith were both inferior to the check. 
The 23 unnamed varieties grown only in 1920, 1921, and 1922, and 
designated by C. I. numbers from 5306 to 5346, are all medium-grain 
rices. Many of these varieties mature early and yield well, but 
owing to weak straw (lodging) and shattering they are of no com- 
mercial promise. However, some of these varieties, because of heavy 
s tooling, early maturity, and good yields, should be of value asjbreed- 
ing material. 
SUMMARY 
The soil on the Biggs Rice Field [Station is Stockton clay adobe 
a dark-gray to black clay which is typical of a large area on which 
rice is grown in the Sacramento Valley. 
The summer months are hot and the winter months are cool, with 
occasional freezes. June, July, and August are usually hot. A daily 
range in temperature of 40° F. is common during the growing 
season. 
The average annual precipitation from 1913 to 1924 was 20.85 
inches. December, January, and February are the three months 
of greatest rainfall. 
